Boss Monster the Dungeon-Building Card Game Wiki

Leviathan Egg is an Advanced Monster Room introduced in the Portable Power Expansion Pack.


The color palette is meant to mimic the colors of the screen of a classic Game Boy.


Due to the Portable effect of this card, the underlying text can be activated every other turn. One could build the Room and return it to their hand on the next turn, thus activating its effect. This card works well with rooms that have a "cycling" effect.